The majority of the text in this filewas extracted from the Juno Mission Plan Document, S. Stephens, 29 March2011.[JPL D-35556]
Juno launched on 5 August 2011. The spacecraft uses a deltaV-EGA trajectory consisting of a two part deep space maneuver on 30 August and 14 September 2012 followed by an Earth gravity assist on 9 October 2013 at an altitude of 559 km. Jupiter arrival is on 5 July 2016 using two 53.5-day capture orbits prior to commencing operations for a 1.3-(Earth) year-long prime mission comprising 32 high inclination, high eccentricity orbits of Jupiter. The orbit is polar (90 degree inclination) with a periapsis altitude of 4200-8000 km and a semi-major axis of 23.4 RJ (Jovian radius) giving an orbital period of 13.965 days. The primary science is acquired for approximately 6 hours centered on each periapsis although fields and particles data are acquired at low rates for the remaining apoapsis portionof each orbit.
Currently, 5 of the first 7 periapses are dedicated to microwave radiometry of Jupiter's deep atmosphere with most of the remaining orbits dedicated to gravity measurements to determine the structure of Jupiter's interior. All orbits will include fields and particles measurements of the planet's auroral regions. Juno is spin stabilized with a rotation rate of 2 rotations per minute (RPM). For the radiometry orbits the spin axis is precisely perpendicular to the orbit plane so that the radiometer fields of view pass through the nadir. For gravity passes, the spin axis is aligned to the Earth direction, allowing for Doppler measurements through the periapsis portion of the orbit. The orbit plane is initially very close toperpendicular to the Sun-Jupiter line and evolves over the 1.3-year mission.
Generally, data acquired during the periapsis passes are recorded and played back over the subsequent apoapsis portion of the orbit, although some datacan be downlinked during the gravity passes.